I gain the sense of knowing that I'm playing the game the way I want. I was thinking that this was going to be focused on the lack of night for actual gameplay, instead of just another "but Long Resting is bad" thread. The immediate solution to the problem is to just not do it. It's what I do, and, in fact, I was afraid to do it initially, because time bomb in my head. Even after events play out, I refrain from doing it, not because I feel like it's exploitive or anything, but simply because that's my approach to a lot of optional things, if I don't feel like it's something I have to do, I don't do it. I carry lots of food too. Do I use it in combat? Nope. But I will use it after. Why? Because I can't see stopping in the middle of a fight to "make a sandwich". It's also why I don't change armor in combat, and why I don't loot during combat.
Even if your approach is the healthiest and ultimately that's what I did in my playthrough it's not an answer to everything. Long rest and day night cycle are connected.
Look at it this way:
If your spells have limited use per day, sleeping restores them and you can sleep endlessly then indeed why would you have the limited use of spells in the first place?
In PnP ( correct me if I'm wrong , i never played tabletop!) you have your GM to tell you " you woke up 1 hour ago, you used all your spells...that's your problem. You can't go to sleep again for now"). So you have all this resources management thing that come into play. You CAN'T use them all at once. That's what makes a balanced game.
In BG2 they had no idea how to balance it so they added a day night cycle and a meaningless sleep system that you could spam. They could remove the sleep system together with the spell limit per day. It served immersion and that's it. They forced the fatigue system + random encounters to make at least some kind of game mechanic around it. But effectively your mage was a spell gatling gun.
In BG3 Larian added an incentive for resting -> Talking to your team. That's why they don't have to worry about a day/night cycle also. It was the simplest and most logical solution. That's why your enemies are bullet sponges. To make sure you use those precious spells of yours and have a reason to sleep. Your characters will never feel the need to sleep, you won't get random attacks when going to sleep. Effectively they sacrificed immersion and interactions with your team outside of camp. And earned simplicity in return. They don't have to implement a day -night cycle.
Larian focuses on gameplay above all in an RPG, so that decision is not surprising.
We want a day/night cycle for immersion. But this requires a non-retarded in-game sleep system that has still to be invented for the past 20 years. If you achieve this in this thread I will send all of you a cookie. I have no fucking idea how to do it.